package com.ruoyi.common.utils.security;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * @author ShenShiHao
 */
public class RsaUtils {

    public static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDSVuQA+mr/H80ZjGxXabjh196J" +
            "SmOEuGkWxEdybvqxMfAE5KMTvC5nHMR1FexwCYP6qpKasxZzIUcht5JRVGBtsbxf" +
            "teIHNA9xTW8K90ouJu9OD/azA4CZfqc58yQ/JLQ5ZYsggeARrerCT1a9bT/C7iBl" +
            "6CFXMw5IBfU5tXL4hwIDAQAB";

    /**
     * 私钥解密
     */
    public static String privateKey = "MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBANJW5AD6av8fzRmM" +
            "bFdpuOHX3olKY4S4aRbER3Ju+rEx8ATkoxO8LmccxHUV7HAJg/qqkpqzFnMhRyG3" +
            "klFUYG2xvF+14gc0D3FNbwr3Si4m704P9rMDgJl+pznzJD8ktDlliyCB4BGt6sJP" +
            "Vr1tP8LuIGXoIVczDkgF9Tm1cviHAgMBAAECgYBR8cAKEYU1t3H0Dhz3QRzh/3OX" +
            "EQAMaLuoPveGwW2xMr9LaLePrLR3P2HaK5xdWZetRF6xHiwU1lYb8KR0Qub9n8S7" +
            "kygLiVG9M1f1fULPLCdOORI8JzSn4omeWctsCnda3bjEty12mQNO4TSjZMTEDkZW" +
            "jK6X3CnwEJWeDvXQQQJBAP3FQSfUCfzoSVFHtGwJA8l6BNQBAd50U8MXHdVDLPS1" +
            "10AQKhNzhpmXZDY3cQXcn9ogClNzU9wHbIeS58+KaskCQQDUL/T3LXxhK/vbYAAP" +
            "4kTiyZs1TCY9yRpitj4DOw08Rbg0SIY2u/n9PstDUbTTwOXYVsdv4/2yiCiX3/y/" +
            "AaDPAkEArespO1WbvsOns9fTtBL9kHBarL0//ah124eVP5p5TgDt048AdzI+tjbG" +
            "TE303NKWj1RUH1szxuEjpUquKlOv2QJBAKvGUxrTgPCticvT0NkLBVdPfM3N4tt7" +
            "9VdaT6OP56wWiQQSfkzLKpsgfa7281vFuozD29qyCIzCe5JP6y26JLMCQQCLX46u" +
            "6Yl8tzHM/DaIBgEwOwBLBDJy++qPCysi8uFTcjyZW4ochSSLbHa+iW6H+23YD+oj" +
            "Uo+4tnTsdM2q89WM";

    /**
     * 私钥解密
     *
     * @param text 待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String text) throws Exception {
        return decryptByPrivateKey(privateKey, text);
    }

    /**
     * 公钥解密
     *
     * @param publicKeyString 公钥
     * @param text            待解密的信息
     * @return 解密后的文本
     */
    public static String decryptByPublicKey(String publicKeyString, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 私钥加密
     *
     * @param privateKeyString 私钥
     * @param text             待加密的信息
     * @return 加密后的文本
     */
    public static String encryptByPrivateKey(String privateKeyString, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 私钥解密
     *
     * @param privateKeyString 私钥
     * @param text             待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String privateKeyString, String text) throws Exception {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 公钥加密
     *
     * @param publicKeyString 公钥
     * @param text            待加密的文本
     * @return 加密后的文本
     */
    public static String encryptByPublicKey(String publicKeyString, String text) throws Exception {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 构建RSA密钥对
     *
     * @return 生成后的公私钥信息
     */
    public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(1024);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
        String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
        String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
        return new RsaKeyPair(publicKeyString, privateKeyString);
    }

    /**
     * RSA密钥对对象
     */
    public static class RsaKeyPair {
        private final String publicKey;
        private final String privateKey;

        public RsaKeyPair(String publicKey, String privateKey) {
            this.publicKey = publicKey;
            this.privateKey = privateKey;
        }

        public String getPublicKey() {
            return publicKey;
        }

        public String getPrivateKey() {
            return privateKey;
        }
    }

}
